Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2778c925748f104…

MALICIOUS

PDF

95.0 KB Created: 2021-09-16 05:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ab775ba98e3b87abed6fa8e2effb016 SHA-1: 7b76538ed3bc262bdd1116455210dcc7a077f948 SHA-256: f2778c925748f1041db02685d6ec4f5191d162da5c528aa74d4c695b00031eed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=navegador+gps+para+movil+android PDF link annotation
    • https://biomisszio.hu/tmp/97935613537.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909100537299619.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/jejubowoz.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/mukigebazejaxexavixuja.pdfIn PDF document text
    • http://esen.life/userfiles/file/sabumitizinekodawakojajep.pdfIn PDF document text
    • https://vestol.bg/files/file/tiseder.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16142a5af8c29d---vibituwegebewonoguxalim.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c7nvdjmmnsq599mu5jnvdjaskf/ziluvabexesivijawosefi.pdfIn PDF document text
    • http://strandedtattoo.info/file/lugopuziwa.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hs4i5b68i01kpovpvmip0pf9bc/93196597403.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/pataxagenemegipiregipiro.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tewirux.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/52006521570.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79983800298.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/67801436092.pdfIn PDF document text
    • https://limsurdua.com/contents/files/83688014853.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/51251265387.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_152053.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/32663913198.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/rapejuji.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/kisozo.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/12504125312.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/regudopasusotudoset.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 10680 bytes
SHA-256: 557bc4e23d7b32cc2573be04f3cd8fe773ac86964dc984c64ea1b3fe1ec9a4ec
font_01_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 19136 bytes
SHA-256: e7674fe446202a20b2d4bcb22ad2fa7f6918d15ba67a4bc2317045e00eaad483
font_02_sfnt_off00015601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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